Class: RBS::ConstantTable

Inherits:
Object
  • Object
show all
Defined in:
lib/rbs/constant_table.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(builder:) ⇒ ConstantTable

Returns a new instance of ConstantTable.



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# File 'lib/rbs/constant_table.rb', line 14

def initialize(builder:)
  @definition_builder = builder
  @constant_scopes_cache = {}
end

Instance Attribute Details

#constant_scopes_cache ⇒ Object (readonly)

Returns the value of attribute constant_scopes_cache.



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# File 'lib/rbs/constant_table.rb', line 4

def constant_scopes_cache
  @constant_scopes_cache
end

#definition_builder ⇒ Object (readonly)

Returns the value of attribute definition_builder.



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# File 'lib/rbs/constant_table.rb', line 3

def definition_builder
  @definition_builder
end

Instance Method Details

#absolute_type(type, context:) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 19

def absolute_type(type, context:)
  type.map_type_name do |type_name, location|
    absolute_type_name(type_name, context: context, location: location)
  end
end

#absolute_type_name(type_name, context:, location:) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 25

def absolute_type_name(type_name, context:, location:)
  resolver.resolve(type_name, context: context) or
    raise NoTypeFoundError.new(type_name: type_name, location: location)
end

#constant_scopes(name) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 99

def constant_scopes(name)
  constant_scopes_cache[name] ||= constant_scopes0(name, scopes: [])
end

#constant_scopes0(name, scopes: []) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 122

def constant_scopes0(name, scopes: [])
  entry = env.class_decls[name]
  namespace = name.to_namespace

  case entry
  when Environment::ClassEntry
    unless name == BuiltinNames::BasicObject.name
      super_name = entry.primary.decl.super_class&.yield_self do |super_class|
        absolute_type_name(super_class.name, context: entry.primary.context, location: entry.primary.decl.location)
      end || BuiltinNames::Object.name

      constant_scopes0 super_name, scopes: scopes
    end

    entry.decls.each do |d|
      d.decl.members.each do |member|
        case member
        when AST::Members::Include
          if member.name.class?
            constant_scopes_module absolute_type_name(member.name, context: d.context, location: member.location),
                                   scopes: scopes
          end
        end
      end
    end

    scopes.unshift namespace

  when Environment::ModuleEntry
    constant_scopes0 BuiltinNames::Module.name, scopes: scopes
    constant_scopes_module name, scopes: scopes

  else
    raise "Unexpected declaration: #{name} (#{entry.class})"
  end

  scopes
end

#constant_scopes_module(name, scopes:) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 103

def constant_scopes_module(name, scopes:)
  entry = env.class_decls[name]
  namespace = name.to_namespace

  entry.decls.each do |d|
    d.decl.members.each do |member|
      case member
      when AST::Members::Include
        if member.name.class?
          constant_scopes_module absolute_type_name(member.name, context: d.context, location: member.location),
                                 scopes: scopes
        end
      end
    end
  end

  scopes.unshift namespace
end

#env ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 6

def env
  definition_builder.env
end

#name_to_constant(name) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 30

def name_to_constant(name)
  case
  when entry = env.constant_decls[name]
    type = absolute_type(entry.decl.type, context: entry.context)
    Constant.new(name: name, type: type, entry: entry)
  when entry = env.class_decls[name]
    type = Types::ClassSingleton.new(name: name, location: nil)
    Constant.new(name: name, type: type, entry: entry)
  end
end

#resolve_constant_reference(name, context:) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 45

def resolve_constant_reference(name, context:)
  raise "Context cannot be empty: Specify `[Namespace.root]`" if context.empty?

  head, *tail = split_name(name)

  head_constant = case
                  when name.absolute?
                    name_to_constant(TypeName.new(name: head, namespace: Namespace.root))
                  when context == [Namespace.root]
                    name_to_constant(TypeName.new(name: head, namespace: Namespace.root))
                  else
                    resolve_constant_reference_context(head, context: context) ||
                      resolve_constant_reference_inherit(head, scopes: constant_scopes(context.first.to_type_name))
                  end

  if head_constant
    tail.inject(head_constant) do |constant, name|
      resolve_constant_reference_inherit name,
                                         scopes: constant_scopes(constant.name),
                                         no_object: constant.name != BuiltinNames::Object.name
    end
  end
end

#resolve_constant_reference_context(name, context:) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 69

def resolve_constant_reference_context(name, context:)
  head, *tail = context

  if head
    if head.path.last == name
      name_to_constant(head.to_type_name)
    else
      name_to_constant(TypeName.new(name: name, namespace: head)) ||
        resolve_constant_reference_context(name, context: tail)
    end
  end
end

#resolve_constant_reference_inherit(name, scopes:, no_object: false) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 82

def resolve_constant_reference_inherit(name, scopes:, no_object: false)
  scopes.each do |context|
    if context.path == [:Object]
      unless no_object
        constant = name_to_constant(TypeName.new(name: name, namespace: context)) ||
          name_to_constant(TypeName.new(name: name, namespace: Namespace.root))
      end
    else
      constant = name_to_constant(TypeName.new(name: name, namespace: context))
    end

    return constant if constant
  end

  nil
end

#resolver ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 10

def resolver
  @resolver ||= TypeNameResolver.from_env(env)
end

#split_name(name) ⇒ Object 



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# File 'lib/rbs/constant_table.rb', line 41

def split_name(name)
  name.namespace.path + [name.name]
end